Abstract
Transition energies and rates between the and levels of ions in the Be isoelectronic sequence (nuclear charges Z = 7-28, 30, 36, 42) are calculated in the valence and core-valence limit using the multiconfiguration Dirac-Fock method. The Breit interaction and finite nuclear mass effects are taken into account in subsequent relativistic configuration-interaction calculations. Separately optimized orbital sets are used for the initial and final states in the transitions. The transition matrix elements are evaluated with an efficient transformation technique. The calculated energy separations and transition probabilities are compared with critically evaluated experimental values and with results from other recent calculations.
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